Auralex MAX Wall Corner Couplers (Burgundy, Box of 12)The patent pending, interlocking MAX Wall acoustic treatment system is made to grow and grow as your needs change it can just go on and on and on, but only if you need it to. Don't buy more than your place requires and don't bankrupt your pocketbook when a simple MAX Wall system might be all you need! You want modular? MAX Wall's your answer. For those needing their MAX Walls to join at 90 angles, use these MAX Wall CornerCouplers.